/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.spring;

import com.je.bpm.engine.impl.asyncexecutor.DefaultAsyncJobExecutor;
import com.je.bpm.engine.impl.asyncexecutor.ExecuteAsyncRunnable;
import com.je.bpm.engine.impl.persistence.entity.JobEntity;
import com.je.bpm.engine.runtime.Job;
import org.springframework.core.task.TaskExecutor;

import java.util.concurrent.RejectedExecutionException;

/**
 * This is a spring based implementation of the Job Executor using spring abstraction {@link TaskExecutor} for performing background task execution.
 * The idea behind this implementation is to externalize the configuration of the task executor, so it can leverage to Application servers controller thread pools, for example using the commonj API.
 * The use of unmanaged thread in application servers is discouraged by the Java EE spec.
 */
public class SpringAsyncExecutor extends DefaultAsyncJobExecutor {

    protected TaskExecutor taskExecutor;
    protected SpringRejectedJobsHandler rejectedJobsHandler;

    public SpringAsyncExecutor() {
    }

    public SpringAsyncExecutor(TaskExecutor taskExecutor, SpringRejectedJobsHandler rejectedJobsHandler) {
        this.taskExecutor = taskExecutor;
        this.rejectedJobsHandler = rejectedJobsHandler;
    }

    public TaskExecutor getTaskExecutor() {
        return taskExecutor;
    }

    /**
     * Required spring injected {@link TaskExecutor} implementation that will be used to execute runnable jobs.
     *
     * @param taskExecutor
     */
    public void setTaskExecutor(TaskExecutor taskExecutor) {
        this.taskExecutor = taskExecutor;
    }

    public SpringRejectedJobsHandler getRejectedJobsHandler() {
        return rejectedJobsHandler;
    }

    /**
     * Required spring injected {@link SpringRejectedJobsHandler} implementation that will be used when jobs were rejected by the task executor.
     *
     * @param rejectedJobsHandler
     */
    public void setRejectedJobsHandler(SpringRejectedJobsHandler rejectedJobsHandler) {
        this.rejectedJobsHandler = rejectedJobsHandler;
    }

    @Override
    public boolean executeAsyncJob(Job job) {
        try {
            taskExecutor.execute(new ExecuteAsyncRunnable((JobEntity) job, processEngineConfiguration));
            return true;
        } catch (RejectedExecutionException e) {
            rejectedJobsHandler.jobRejected(this, job);
            return false;
        }
    }

    @Override
    protected void initAsyncJobExecutionThreadPool() {
        // Do nothing, using the Spring taskExecutor
    }

}
